Toothed power transmission belt with back fabric

Abstract

A toothed power transmission belt with a smooth back side surface has a back jacket on the back side surface; wherein the back jacket comprises a closed-mesh, knit fabric tube. The fabric tube may be knitted on a circular weft knitting machine and may be heat set after knitting. The fabric tube may be treated with an epoxy, RFL or other treatment to provide for oil resistance, adhesion, frictional properties, etc.

What is claimed is: 
     
       1. A toothed power transmission belt comprising: a rubber belt body with a toothed surface on one side thereof and a smooth back side surface opposite the one side; a tooth jacket covering the toothed surface; a tensile cord embedded in the rubber belt body; and a back jacket on the smooth back side surface; wherein the back jacket comprises a closed-mesh, knit fabric tube, wherein the closed-mesh, knit fabric tube is knitted with an elastic yarn and an inelastic yarn; wherein the back jacket further comprises a coating comprising an epoxy on the closed-mesh, knit fabric tube. 
     
     
       2. The belt of  claim 1  wherein the closed-mesh, knit fabric tube is knitted with a separately fed elastic yarn and a separately fed inelastic yarn. 
     
     
       3. The belt of  claim 2  wherein the elastic yarn comprises polyurethane and the inelastic yarn comprises nylon. 
     
     
       4. The belt of  claim 1  wherein the coating further comprises a latex rubber on the closed-mesh, knit fabric tube.